I've been trying to start Lab 1b and have purchased the Max Pitch Package twice successfully. Once I get to the page where it tells me to to sign into SF, it always gives me this error message. I have reset my password several times and can't log in on the page that is displayed after purchase. However, I'm able to sign in with the same credentials on a separate browser.

OK, I'll try today within the next hour.
Try an incognito or private window.
We will reimburse you for extra payments. Don’t worry.